123 lines
4.0 KiB
Go
123 lines
4.0 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package containerd
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import (
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"context"
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"github.com/containerd/containerd/content"
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"github.com/containerd/containerd/images"
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"github.com/containerd/containerd/oci"
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"github.com/containerd/containerd/platforms"
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"github.com/containerd/typeurl"
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"github.com/gogo/protobuf/proto"
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ptypes "github.com/gogo/protobuf/types"
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"github.com/opencontainers/image-spec/identity"
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imagespec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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)
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var (
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// ErrCheckpointIndexImageNameNotFound is returned when the checkpoint image name is not present in the index
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ErrCheckpointIndexImageNameNotFound = errors.New("image name not present in index")
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// ErrCheckpointIndexRuntimeNameNotFound is returned when the checkpoint runtime name is not present in the index
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ErrCheckpointIndexRuntimeNameNotFound = errors.New("runtime name not present in index")
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)
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// RestoreOpts are options to manage the restore operation
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type RestoreOpts func(context.Context, string, *Client, Image, *imagespec.Index) ([]NewContainerOpts, error)
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// WithRestoreRuntime restores the runtime for the container
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func WithRestoreRuntime(ctx context.Context, id string, client *Client, checkpoint Image, index *imagespec.Index) ([]NewContainerOpts, error) {
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runtimeName, ok := index.Annotations["runtime.name"]
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if !ok {
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return nil, ErrCheckpointIndexRuntimeNameNotFound
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}
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// restore options if present
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m, err := GetIndexByMediaType(index, images.MediaTypeContainerd1CheckpointRuntimeOptions)
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if err != nil {
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if err != ErrMediaTypeNotFound {
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return nil, err
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}
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}
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var options *ptypes.Any
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if m != nil {
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store := client.ContentStore()
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data, err := content.ReadBlob(ctx, store, *m)
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if err != nil {
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return nil, errors.Wrap(err, "unable to read checkpoint runtime")
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}
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if err := proto.Unmarshal(data, options); err != nil {
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return nil, err
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}
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}
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return []NewContainerOpts{
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WithRuntime(runtimeName, options),
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}, nil
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}
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// WithRestoreSpec restores the spec from the checkpoint for the container
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func WithRestoreSpec(ctx context.Context, id string, client *Client, checkpoint Image, index *imagespec.Index) ([]NewContainerOpts, error) {
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m, err := GetIndexByMediaType(index, images.MediaTypeContainerd1CheckpointConfig)
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if err != nil {
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return nil, err
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}
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store := client.ContentStore()
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data, err := content.ReadBlob(ctx, store, *m)
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if err != nil {
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return nil, errors.Wrap(err, "unable to read checkpoint config")
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}
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var any ptypes.Any
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if err := proto.Unmarshal(data, &any); err != nil {
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return nil, err
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}
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v, err := typeurl.UnmarshalAny(&any)
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if err != nil {
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return nil, err
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}
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spec := v.(*oci.Spec)
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return []NewContainerOpts{
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WithSpec(spec),
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}, nil
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}
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// WithRestoreSnapshot restores the snapshot from the checkpoint for the container
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func WithRestoreSnapshot(ctx context.Context, id string, client *Client, checkpoint Image, index *imagespec.Index) ([]NewContainerOpts, error) {
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// get image from annotation
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imageName, ok := index.Annotations["image.name"]
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if !ok {
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return nil, ErrCheckpointIndexImageNameNotFound
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}
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i, err := client.Pull(ctx, imageName, WithPullUnpack)
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if err != nil {
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return nil, err
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}
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diffIDs, err := i.(*image).i.RootFS(ctx, client.ContentStore(), platforms.Default())
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if err != nil {
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return nil, err
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}
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parent := identity.ChainID(diffIDs).String()
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if _, err := client.SnapshotService(DefaultSnapshotter).Prepare(ctx, id, parent); err != nil {
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return nil, err
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}
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return []NewContainerOpts{
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WithImage(i),
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WithSnapshot(id),
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}, nil
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}
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